Harvey Korman plays a Prussian balloonist named...

Harvey Korman plays a Prussian balloonist named Col. Heinrich Von Zeppel who wrecks havoc on the men of “F Troop” (Sunday at 9 p.m. on Nickelodeon).

Gomer gets his first fling at romance when he dates Thelma Lou’s cousin (Mary Grace Canfield) on “The Andy Griffith Show” (Monday at 3:35 p.m. on TBS).

Hugh Beaumont, a.k.a. the Beav’s dad, guests on “The Adventures of Superman” (Monday at 8:30 p.m. on Nickelodeon) in an episode in which a rehabilitated ex-con is threatened with blackmail by a former cellmate.

Johnny Carson ventured into prime time for a cameo appearance on “Get Smart” (Monday at 9:30 p.m. on Nickelodeon) in an episode in which Smart finds he resembles the king of a troubled European country.

Sheila MacRae, then married to Gordon McRae, and the wives of William Holden, Dean Martin, Van Heflin, Forrest Tucker, Alan Ladd and Richard Carlson appear with Lucy on a fashion show on “I Love Lucy” (Tuesday at 3:05 a.m. on TBS).

Aunt Bee (Frances Bavier) visits Gomer on “Gomer Pyle” (Wednesday at 2:05 a.m. on TBS).

Brian Keith, who currently stars in NBC’s “Walter and Emily,” guests on “Alfred Hitchcock Presents” (Wednesday at 10:30 p.m. on Nickelodeon) in an episode in which a successful attorney is persuaded to take on the case of a boy accused of knifing another boy.

Laura’s heart is broken when her father says she is too young to marry Almonzo Wilder on “Little House on the Prairie: He Loves Me, He Loves Me Not” (Friday at 7:05 a.m. on TBS).

Nick at Nite celebrates Valentine’s Day with “When We First Met” (Friday from 9-11 p.m.), featuring four classic episodes from TV Land in which famous TV couples met for the first time.

Before he became Durwood on ‘Bewitched,” Dick York did a guest shot on “Alfred Hitchcock Presents” (Saturday at 11:30 p.m. on Nickelodeon) as a mild-mannered man who decides to steal $500,000 from the company for which he works.